US20200002109A1 - Rubber composition and paper feeding roller formed of the same - Google Patents

Rubber composition and paper feeding roller formed of the same Download PDF

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Publication number
US20200002109A1
US20200002109A1 US16/367,254 US201916367254A US2020002109A1 US 20200002109 A1 US20200002109 A1 US 20200002109A1 US 201916367254 A US201916367254 A US 201916367254A US 2020002109 A1 US2020002109 A1 US 2020002109A1
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Prior art keywords
mass
parts
rubber
less
main body
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US16/367,254
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Inventor
Masashi Hamakubo
Toshiyuki Hirai
Yoshihiro Yamada
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Sumitomo Rubber Industries Ltd
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Sumitomo Rubber Industries Ltd
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Assigned to SUMITOMO RUBBER INDUSTRIES, LTD. reassignment SUMITOMO RUBBER INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YAMADA, YOSHIHIRO, HAMAKUBO, MASASHI, HIRAI, TOSHIYUKI
Publication of US20200002109A1 publication Critical patent/US20200002109A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B65H3/0638—Construction of the rollers or like rotary separators
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/02—Advancing webs by friction roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/12—Delivering or advancing articles from machines; Advancing articles to or into piles by means of the nip between two, or between two sets of, moving tapes or bands or rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/20—Delivering or advancing articles from machines; Advancing articles to or into piles by contact with rotating friction members, e.g. rollers, brushes, or cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • B65H3/52—Friction retainers acting on under or rear side of article being separated
    • B65H3/5246—Driven retainers, i.e. the motion thereof being provided by a dedicated drive
    • B65H3/5276—Driven retainers, i.e. the motion thereof being provided by a dedicated drive the retainers positioned over articles separated from the bottom of the pile
    • B65H3/5284—Retainers of the roller type, e.g. rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/06—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/06—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers
    • B65H5/066—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers the articles resting on rollers or balls
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/013—Fillers, pigments or reinforcing additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6529—Transporting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2401/00—Materials used for the handling apparatus or parts thereof; Properties thereof
    • B65H2401/10—Materials
    • B65H2401/11—Polymer compositions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2401/00—Materials used for the handling apparatus or parts thereof; Properties thereof
    • B65H2401/10—Materials
    • B65H2401/11—Polymer compositions
    • B65H2401/111—Elastomer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2401/00—Materials used for the handling apparatus or parts thereof; Properties thereof
    • B65H2401/20—Physical properties, e.g. lubricity
    • B65H2401/23—Strength of materials, e.g. Young's modulus or tensile strength
    • B65H2401/2311—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/15—Roller assembly, particular roller arrangement
    • B65H2404/153—Arrangements of rollers facing a transport surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2519/00—Chemical characteristics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/1912—Banknotes, bills and cheques or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/06—Office-type machines, e.g. photocopiers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/39—Scanning
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2296—Oxides; Hydroxides of metals of zinc
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2312/00—Crosslinking
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00679—Conveying means details, e.g. roller
    • G03G2215/00683—Chemical properties

Definitions

  • the present disclosure relates to a rubber composition, and a paper feeding roller that includes a roller main body formed by using the rubber composition.
  • a paper feeding roller is used for carrying (passing) sheets such as paper and plastic film, in various equipment such as an image forming apparatus such as a laser printer using electrophotography, an inkjet printer, an image scanner, or an automated teller machine (ATM).
  • an image forming apparatus such as a laser printer using electrophotography, an inkjet printer, an image scanner, or an automated teller machine (ATM).
  • ATM automated teller machine
  • Examples of the paper feeding roller include a paper supply roller, a carrying roller, a platen roller, a paper discharging roller, and the like, which rotate while coming into contact with the sheet so as to allow the sheet to pass through by friction.
  • the paper feeding roller is generally made of an elastic body such as rubber or soft resin, and is configured such that a shaft made of metal or the like is inserted through a through hole of a roller main body having a through hole through which the shaft is inserted, and the shaft is fixed thereto.
  • the roller main body is further required to have, for example, excellent ozone resistance, weather fastness, and the like for being used in image forming apparatuses, or to have excellent weather fastness, heat aging resistance, cold resistance, low-temperature characteristics, and the like in order to exhibit stable performance in an ATM installed in various places.
  • Patent Document 1 Japanese Patent Laid-Open No. 2016-65197
  • Patent Document 2 Japanese Patent Laid-Open No. 2016-222829
  • the tensile strengths of the roller main bodies in the examples of Patent Document 1 and 2 are all less than 10 MPa, which is a tensile strength insufficient for a paper feeding roller used in equipment such as a high-speed image scanner as described above, and therefore further improvement is required.
  • Example 5 of Patent Document 2 the tensile strength of the roller main body is 10 MPa or more.
  • Example 5 because of the above-mentioned condition in Example 5, a large amount of calcium carbonate is used in combination with an amorphous silica as a filler, and therefore it is not possible to avoid a decrease in abrasion resistance of the roller main body and a deterioration in a paper feeding performance of the paper feeding roller as described above.
  • the disclosure provides a rubber composition capable of imparting a high tensile strength to a roller main body so as to be able to be used specifically for equipment that allows paper to pass through at high speed, while maintaining high abrasion resistance of the roller main body and a favorable paper feeding performance of the paper feeding roller.
  • the disclosure provides a paper feeding roller in which a roller main body is formed using the above-mentioned rubber composition.
  • a rubber composition for forming a roller main body of a paper feeding roller the rubber composition containing: a rubber that includes at least EPDMs; more than 20 parts by mass and 30 parts by mass or less of a filler per 100 parts by mass of a total amount of the rubber; and 2.5 parts by mass or more of a peroxide crosslinking agent per 100 parts by mass of the total amount of the rubber, in which the EPDMs include at least a non-oil extended EPDM having an ethylene content of 55% or more and 72% or less, and the filler contains at least 15 parts by mass or more and 30 parts by mass less of an amorphous silica per 100 parts by mass of the total amount of the rubber.
  • a paper feeding roller that includes a roller main body made of this rubber composition.
  • FIG. 1 is an enlarged perspective view showing a part of a paper feeding roller of the present disclosure, which is an example of an embodiment.
  • FIG. 2 is a view for explaining a method of measuring a frictional coefficient of a paper feeding roller in order to evaluate a paper feeding performance of the paper feeding roller formed by using a rubber composition of an example and a comparative example of the present disclosure.
  • a rubber composition capable of imparting a high tensile strength to a roller main body so as to be able to be used specifically for equipment that allows paper to pass through at high speed, while maintaining high abrasion resistance of the roller main body and a favorable paper feeding performance of the paper feeding roller.
  • a rubber composition of the present disclosure contains: a rubber that includes at least EPDMs; more than 20 parts by mass and 30 parts by mass or less of a filler per 100 parts by mass of a total amount of the rubber; and 2.5 parts by mass or more of a peroxide crosslinking agent per 100 parts by mass of the total amount of the rubber, in which the EPDMs include at least a non-oil extended EPDM having an ethylene content of 55% or more and 72% or less, and the filler contains at least 15 parts by mass or more and 30 parts by mass less of an amorphous silica per 100 parts by mass of the total amount of the rubber.
  • the rubber composition of the present disclosure by blending in each component at a predetermined proportion, it is possible to impart a high tensile strength to a roller main body so as to be used for equipment that allows paper to pass through at high speed as described above, while maintaining high abrasion resistance of the roller main body and a favorable paper feeding performance of the paper feeding roller.
  • a rubber including at least EPDMs is used as described above.
  • a non-oil extended EPDM having an ethylene content within the above-mentioned range is at least used among various EPDMs into which double bonds are introduced by adding a small amount of a third component (diene) to ethylene and propylene.
  • dienes examples include ethylidene norbornene (ENB), dicyclopentadiene (DCPD), and the like.
  • non-oil extended EPDMs having an ethylene content within the above-mentioned range are not limited thereto, and for example, it is possible to use one or two or more of the various non-oil extended EPDMs described below.
  • NORDEL registered trademark (manufactured by Dow Chemical Company) Series IP 3640 [ethylene content: 55%, diene content: 1.8%], IP 3720P [ethylene content: 70%, diene content: 0.6%], IP 3722P [ethylene content: 71%, diene content: 0.5%], IP 3745P [ethylene content: 70%, diene content: 0.5%], IP 3760P [ethylene content: 67% diene content: 2.2%], IP 4640 [ethylene content: 55%, diene content: 4.9%], IP 4725P [ethylene content: 70%, diene content: 4.9%], IP 4760P [ethylene content: 67% diene content: 4.9%], IP 4770R [ethylene content: 70%, diene content: 4.9%], IP 4770P [ethylene content: 70%, diene content: 4.9%], IP 4785HM [ethylene content: 68%, diene content: 4.9%], IP 3722P EL [ethylene content: 71%, diene content: 0.5%], IP 3745P EL [ethylene content: 70%, diene content
  • EP21 [ethylene content: 61%, diene content: 5.8%], EP51 [ethylene content: 67%, diene content: 5.8%], EP25 [ethylene content: 58.5%, diene content: 5.1%], EP123 [ethylene content: 58%, diene content: 4.5%], EP103AF [ethylene content: 59%, diene content: 4.5%], EP107F [ethylene content: 62%, diene content: 4.5%], EP57F/C [ethylene content: 67%, diene content: 4.5%], and EP93 [ethylene content: 55%, diene content: 2.7%] which are manufactured by JSR Corporation
  • Mitsui EPT manufactured by Mitsui Chemicals, Inc. Series 1045 [ethylene content: 58%, diene content: 5.0%], 1070 [ethylene content: 57%, diene content: 4.0%], 2060M [ethylene content: 55%, diene content: 2.3%], 3045 [ethylene content: 56%, diene content: 4.7%], 3070 [ethylene content: 58%, diene content: 4.7%], 3091 [ethylene content: 61%, diene content: 5.4%], 3092M [ethylene content: 65%, diene content: 4.6%], 3110M [ethylene content: 56%, diene content: 5.0%], 4070 [ethylene content: 56%, diene content: 8.1%], X-3012P [ethylene content: 72%, diene content: 3.6%], and 3092PM [ethylene content: 65%, diene content: 4.6%]
  • a proportion of the non-oil extended EPDM is preferably 20 parts by mass or more and preferably 80 parts by mass or less with respect to 100 parts by mass of the total amount of the rubber.
  • an oil extended EPDM together with a non-oil extended EPDM for the EPDMs.
  • a process oil is blended with the rubber and kneaded until becoming uniformly mixed.
  • a kneading time is shortened by blending in the oil extended EPDM with which an extender oil has become already mixed, and therefore workability of kneading can be improved.
  • an appropriate amount of extender oil contained in the oil extended EPDM does not bleed to the outer peripheral surface of the roller main body.
  • a process oil such as paraffin oil
  • a content of the oil it is preferable not to blend in (exclude) a process oil such as paraffin oil, and even when such an oil has been blended in, it is preferable to set a content of the oil to about 2 parts by mass or less with respect to 100 parts by mass of the total amount of rubber content.
  • oil extended EPDM it is possible to use various oil extended EPDMs obtained by extending a raw material EPDM by an arbitrary proportion using any extension oil.
  • the raw material EPDM which is a base of the oil extended EPDM
  • Examples of the extender oil include a paraffin oil and the like.
  • An oil extended amount of the extender oil is not particularly limited, and is preferably 70 parts by mass (70 phr) or more, and preferably 150 parts by mass (150 phr) or less per 100 parts by mass of EPDMs.
  • An oil extended EPDM that satisfies these conditions is not limited thereto, and for example, it is possible to use one or two or more of the various oil extended EPDMs described below.
  • EP98 ethylene content: 66%, diene content: 4.5%, oil extended amount: 75 phr
  • JSR Corporation Mitsui EPT X-3042E
  • ethylene content: 66%, diene content: 4.7%, oil extended amount: 120 phr manufactured by Mitsui Chemicals, Inc.
  • an amount of solid contents (rubber content) in the oil extended rubber is defined as an amount of rubber, thereby obtaining a total amount of rubber, which is a reference for a proportion of each component, and a proportion of each component of rubbers and components other than rubbers.
  • a proportion of the oil extended EPDM in which an amount of solid contents (EPDM as rubber content) contained in the oil extended EPDM is defined as an amount of rubber, is preferably 10 parts by mass or more and preferably 80 parts by mass or less with respect to 100 parts by mass of the total amount of the rubber.
  • a proportion of the oil extended EPDM is preferably 50 parts by mass or more and preferably 70 parts by mass or less in the above-mentioned range.
  • IR isoprene rubber
  • BR butadiene rubber
  • SBR styrene butadiene rubber
  • NBR acrylonitrile butadiene rubber
  • FKM fluororubber
  • CR chloroprene rubber
  • VMQ silicone rubber
  • any of a non-oil extended rubber or an oil extended rubber may be used.
  • IR which functions to increase a frictional coefficient of a roller main body made of EPDMs with respect to paper to improve the paper feeding performance of the paper feeding roller, is particularly preferable.
  • any of various polymers having a polyisoprene structure can be used.
  • IR examples include, but are not limited to, at least one of Nipol (registered trademark) IR2200, IR2200R, and the like manufactured by Zeon Corporation.
  • a proportion of the IR is preferably 10 parts by mass or more, particularly preferably 20 parts by mass or more, and is preferably 60 parts by mass or less, particularly preferably 50 parts by mass or less with respect to 100 parts by mass of the total amount of the rubber.
  • a remaining amount of rubber is non-oil extended EPDMs and oil extended EPDMs.
  • a total proportion of non-oil extended EPDMs and oil extended EPDMs is preferably 40 parts by mass or more, particularly preferably 50 parts by mass or more, and preferably 90 parts by mass or less, particularly preferably 80 parts by mass or less with respect to 100 parts by mass of the total amount of rubber.
  • a proportion of other rubbers such as IR is a proportion of non-oil extended rubbers in the case where the other rubbers are non-oil extended rubbers, and a proportion of other rubbers is a proportion of the rubber content as solid contents, which is contained in oil extended rubbers, in the case of oil extended rubbers as described above.
  • the rubber may be a rubber in which rubbers other than IR are not contained, and the total amount of rubber is that of non-oil extended EPDMs and oil extended EPDMs, that is, a total proportion of non-oil extended EPDMs and oil extended EPDMs which is 100 parts by mass.
  • a proportion of non-oil extended EPDMs is preferably 80 parts by mass or less.
  • a proportion (total amount) of the filler containing at least an amorphous silica is limited to more than 20 parts by mass and 30 parts by mass or less per 100 parts by mass of the total amount of the rubber is as follows.
  • the total amount of the filler is set to be within the above-mentioned range, it is possible impart favorable abrasion resistance and a high tensile strength to the roller main body while maintaining favorable workability of the rubber composition.
  • the total amount of the filler is preferably 21 parts by mass or more and preferably 23 parts by mass or more per 100 parts by mass of the total amount of the rubber, in the above-mentioned range.
  • At least an amorphous silica is used as the filler.
  • any of wet-type process silicas or dry-type process silicas classified according to a manufacturing method therefore can be used, and an amorphous silica subjected to hydrophobic treatment or the like can also be used.
  • the amorphous silica is not limited to the following examples, and for example, it is possible to use one or two or more of various amorphous silicas including the Nipsil (registered trademark) Series manufactured by Tosoh Silica Corporation; various amorphous silicas of AEROSIL (registered trademark) Series manufactured by Nippon Aerosil Co., Ltd; and the like.
  • a proportion of the amorphous silica is limited to 15 parts by mass or more and 30 parts by mass or less with respect to 100 parts by mass of the total amount of rubber is as follows.
  • a proportion of the amorphous silica to be within the above-mentioned range, it is possible impart favorable abrasion resistance and a high tensile strength to the roller main body while maintaining favorable workability of the rubber composition.
  • the amorphous silica may be used alone (including a case of using two or more kinds of the amorphous silica in combination), or a filler other than the amorphous silica may be used in combination.
  • fillers for example, one or two or more fillers such as carbon black, calcium carbonate, zinc oxide, silica compounds other than amorphous silica, clay, talc, magnesium carbonate, aluminum hydroxide, and titanium oxide can be used.
  • a proportion of another filler may be set such that the total amount of the filler falls within the aforementioned range by setting a proportion of the amorphous silica to a predetermined value within the aforementioned range, and adding the other filler.
  • a specific proportion of the other filler is not limited thereto, and is preferably, for example, 15 parts by mass or less per 100 parts by mass of the total amount of the rubber.
  • a lower limit of a proportion of other fillers is 0 parts by mass, which means that a case where other fillers are not used in combination is included.
  • the peroxide crosslinking agent is not limited to the following examples. It is possible to use, for example, one of two or more of benzoyl peroxide, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, di(tert-butylperoxy)diisopropylbenzene, 1,4-bis[(tertbutyl)peroxyisopropyl]benzene, di(tert-butylperoxy) benzoate, tert-butyl peroxybenzoate, dicumyl peroxide, tert-butyl cumyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, di-tert-butyl peroxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)-3-hexen
  • a proportion of the peroxide crosslinking agent is limited to 2.5 parts by mass or more per 100 parts by mass of the total amount of rubber is because when a proportion of the peroxide crosslinking agent is less than this range, abrasion resistance of the roller main body deteriorates.
  • a proportion of the peroxide crosslinking agent is preferably 2.6 parts by mass or more per 100 parts by mass of the total amount of the rubber, in the above-mentioned range.
  • a proportion of the peroxide crosslinking agent is preferably 5 parts by mass or less, particularly preferably 4 parts by mass or less per 100 parts by mass of the total amount of the rubber, in the above-mentioned range.
  • the amorphous silica inhibits crosslinking of the EPDMs by the peroxide crosslinking agent in some cases.
  • roller main body having sufficient mechanical strength in some cases.
  • the rubber composition may be blended with polyethylene glycols, which function to mask the —OH groups on the surface of the amorphous silica and suppress crosslinking inhibition.
  • polyethylene glycols various polyethylene glycols having an arbitrary average molecular weight can be used.
  • a proportion of polyethylene glycols is preferably 1% or more, and preferably 4% or less with respect to the total amount of the filler.
  • Components to be generally blended into the rubber composition such as an antioxidant, a co-crosslinking agent, a pigment, a plasticizer, and a processing aid, may be added to the rubber composition, at an appropriate amount not impairing the effects of the present disclosure.
  • FIG. 1 is a perspective view showing the paper feeding roller of the present disclosure, which is an example of an embodiment.
  • a paper feeding roller 1 of this example includes a roller main body 2 formed by molding the above-described rubber composition of the present disclosure into a tubular shape and crosslinking.
  • a through hole 3 having a circular cross-section is provided at the center of the roller main body 2 , and a shaft 4 having a columnar shape, which is linked to a driving system (not shown), is inserted into the through hole 3 so as to be fixed.
  • An outer peripheral surface 5 of the roller main body 2 which comes in contact with a sheet, is formed in a cylindrical shape concentric with the through hole 3 and the shaft 4 in the example of the drawing.
  • the roller main body 2 and the shaft 4 are fixed to each other by, for example, press-fitting the shaft 4 having a larger outer diameter than an inner diameter of the through hole 3 into the through hole 3 of the roller main body 2 so that idling does not occur.
  • the shaft 4 is made of, for example, metal, ceramic, hard resin, or the like.
  • a plurality of roller main bodies 2 may be fixed to a plurality of locations on one shaft 4 , if necessary.
  • the roller main body 2 is manufactured by, for example, molding the rubber composition into a tubular shape by extrusion molding or the like, and then crosslinking by a press crosslinking method or the like; or by molding the rubber composition into a tubular shape by a transfer molding method or the like and crosslinking at the same time.
  • the outer peripheral surface 5 of the roller main body 2 may be polished so as to have a predetermined surface roughness, or may be subjected to knurl processing, surface texturing, or the like at any point in the manufacturing process.
  • both ends of the roller main body 2 may be cut so that the outer peripheral surface 5 has a predetermined width.
  • the outer peripheral surface 5 of the roller main body 2 may be coated with any coating layer.
  • the roller main body 2 may be formed to have a two-layer structure of an outer layer on the outer peripheral surface 5 side and an inner layer on the through hole 3 side.
  • At least the outer layer is preferably formed of the rubber composition of the present disclosure.
  • the roller main body 2 when considering simplifying the structure, improving productivity, lowering manufacturing costs, and the like, it is preferable that the roller main body 2 have a single-layer structure as shown in FIG. 1 .
  • roller main body 2 may have a porous structure.
  • the roller main body 2 preferably has a substantially nonporous structure.
  • the paper feeding roller 1 is used for equipment such as a high-speed image scanner, which allows a sheet to pass through at a high speed of a sheet passing speed of 200 sheets/minute or more, it is required that the roller main body 2 does not break during use.
  • a tensile strength TS of the roller main body 2 which is measured by a measurement method described in Japan Industrial Standard JIS K 6251: 2010 “Method for obtaining tensile properties of vulcanized rubber and thermoplastic rubber,” is preferably 10 MPa or more.
  • a tensile strength TS of the roller main body 2 is preferably 13 MPa or less in the above-mentioned range.
  • roller main body 2 having a tensile strength TS exceeding this range, a large amount exceeding 30 parts by mass of the filler containing the amorphous silica needs to be blended in per 100 parts by mass of the total amount of rubber.
  • roller main body 2 have a type A durometer hardness of less than 60 for favorable paper feeding.
  • the roller main body 2 preferably has a type A durometer hardness of 20 or more, particularly preferably 40 or more.
  • the through hole 3 may be provided at a position eccentric from the center of the roller main body 2 .
  • the outer peripheral surface 5 of the roller main body 2 may have not only a tubular shape, but also an irregular shape, for example, a shape in which a part of the tubular outer peripheral surface is cut out into a planar shape.
  • the roller main body 2 having an irregular shape may be directly formed by the above-described manufacturing method and then crosslinked, or the roller main body 2 formed into a tubular shape may be made to have an irregular shape by post-processing.
  • the roller main body 2 may be deformed into an irregular shape by press-fitting the shaft 4 which has been made to have a deformed shape corresponding to an irregular shape of the roller main body 2 , into the through hole 3 of the roller main body 2 formed into a tubular shape.
  • polishing, knurl processing, surface texturing, and the like of the outer peripheral surface 5 can be performed on the tubular outer peripheral surface 5 before deformation, and therefore workability can be improved.
  • the paper feeding roller of the present disclosure can be incorporated into various image forming apparatuses which use electrophotography, such as laser printers, electrostatic copying machines, plain paper facsimile machines, or multifunction machines thereof.
  • paper feeding roller of the present disclosure can also be incorporated into, for example, an image scanner, an ink jet printer, an ATM, or the like.
  • the roller main body of the paper feeding roller of the present disclosure has a high tensile strength, and thus can be suitability used by being incorporated into, for example, equipment such as a high-speed image scanner, which allows a sheet to pass through at a high speed of a sheet passing speed of 200 sheets/minute or more.
  • the paper feeding roller of the present disclosure can be used as, for example, a paper supply roller, a carrying roller, a platen roller, a paper discharging roller, or the like, which are incorporated into such equipment, and rotate while coming into contact with paper to carry the paper by friction.
  • abrasion resistance of the roller main body is excellent, and a tensile strength also high, and therefore breakage does not occur during use even when the paper feeding roller is used by being incorporated into the above-mentioned equipment such as a high-speed image scanner.
  • amorphous silica [Nipsil VN3 manufactured by Tosoh Silica
  • a rubber composition was prepared in the same manner as in Example 1 except that an amount of the non-oil extended EPDM was 30 parts by mass, an amount of the oil extended EPDM was 140 parts by mass (solid contents: 70 parts by mass), an amount of the amorphous silica was 20 parts by mass, an amount of the polyethylene glycol was 0.5 parts by mass, and an amount of the peroxide crosslinking agent was 3 parts by mass.
  • a total amount of the filler was 23.2 parts by mass.
  • a rubber composition was prepared in the same manner as in Example 1 except that an amount of the non-oil extended EPDM was 30 parts by mass, an amount of the oil extended EPDM was 140 parts by mass (solid contents: 70 parts by mass), an amount of the amorphous silica was 15 parts by mass, an amount of the polyethylene glycol was 1 part by mass, and an amount of the peroxide crosslinking agent was 3 parts by mass; and that 10 parts by mass of clay [classified hard clay product, ST-CROWN manufactured by Shiraishi Calcium Kaisha, Ltd.] was blended in as a filler.
  • a total amount of the filler was 28.2 parts by mass.
  • a rubber composition was prepared in the same manner as in Example 1 except that an amount of the non-oil extended EPDM was 75 parts by mass, an amount of the oil extended EPDM was 50 parts by mass (solid contents: 25 parts by mass), an amount of the amorphous silica was 5 parts by mass, and an amount of the polyethylene glycol was 0.1 parts by mass.
  • a total amount of the filler was 8.2 parts by mass.
  • a rubber composition was prepared in the same manner as in Example 1 except that 70 parts by mass of clay [classified hard clay product, ST-CROWN manufactured by Shiraishi Calcium Kaisha, Ltd.] was blended in as a filler instead of blending in the amorphous silica, and that an amount of polyethylene glycol was 2.1 parts by mass.
  • a total amount of the filler was 73.2 parts by mass.
  • a rubber composition was prepared in the same manner as in Example 1 except that an amount of amorphous silica was 15 parts by mass, and an amount of polyethylene glycol was 1.5 parts by mass; and that 40 parts by mass of talc [Mistron (registered trademark) vapor manufactured by Imerys Specialities Japan Co., Ltd.] was blended in as a filler.
  • a total amount of the filler was 58.2 parts by mass.
  • a rubber composition was prepared in the same manner as in Example 1 except that an amount of the peroxide crosslinking agent was 2 parts by mass.
  • a total amount of the filler was 28.2 parts by mass.
  • the rubber compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were press-crosslinked under the conditions of 170° C. for 20 minutes to form sheets having a thickness of 2 mm, and three sheets thereof were laminated to prepare test pieces.
  • a tensile test was carried out in accordance with a test method described in the above-mentioned standard under an environment of a temperature at 23 ⁇ 2° C., and therefore a tensile strength TS (MPa) and an elongation at break Eb (%) were obtained.
  • the rubber compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were transfer-molded into a tubular shape under conditions of 170° C. for 20 minutes, and while being in a state where the shaft 4 with an outer diameter of 17 mm was pressed into the through hole 3 , the transfer-molded rubber compositions were polished so as to have an outer diameter of 23 mm by using a cylindrical grinding machine, and then cut to have a width of 30 mm, and therefore a paper feeding roller 1 having a tubular roller main body 2 was produced.
  • W vertical load
  • a paper 7 having a width of 60 mm and a length of 210 mm
  • P paper plain paper
  • PTFE polytetrafluoroethylene
  • a carrying force F (gf) applied to a load cell 8 in contact with one end of the paper 7 was measured when the roller main body 2 was rotated at 200 rpm in a direction indicated by a single dot-dashed line arrow R in an environment of a temperature of 23 ⁇ 2° C. and a relative humidity of 55 ⁇ 10%.
  • W 500 gf
  • roller main body 2 was continuously rotated at 200 rpm for 10 minutes in the direction indicated by the single dot-dashed line arrow R in an environment of a temperature of 23 ⁇ 2° C. and a relative humidity of 55 ⁇ 10%.
  • Abrasion rate (%) (initial mass ⁇ mass after abrasion)/(initial mass) ⁇ 100 (2)
  • Example 1 Example 2
  • Example 3 Components Non-oil extended Ethylene content 66 66 66 EPDM (%) Parts by mass 50 30 30
  • Oil extended EPDM 100 140 140 (parts by mass) [50] [70] [70] [solid content (parts by mass)] Filler Amorphous silica 25 20 15 (parts by mass) Carbon black 0.2 0.2 0.2 Zinc oxide 3 3 3 Clay — — 10 Talc — — — Total 28.2 23.2 28.2 Polyethylene glycol 0.7 0.5 1 Peroxide crosslinking agent (parts by 2.7 3 3 mass) Test Type A durometer hardness 54 44 40
  • Tensile test TS (MPa) 12.4 11.5 10.6 E b (%)
  • 640 830 Evaluation ⁇ ⁇ ⁇ Frictional Numerical value 1.72 1.92 1.92 coefficient ⁇ Evaluation ⁇ ⁇ ⁇ Abrasion resistance Abrasion rate (%) 0.33 0.65 0.82 Evaluation ⁇ ⁇ ⁇ ⁇

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JP7157901B2 (ja) * 2018-06-28 2022-10-21 住友ゴム工業株式会社 ゴム組成物とそれを用いた紙送りローラ
JP7157900B2 (ja) * 2018-06-28 2022-10-21 住友ゴム工業株式会社 ゴム組成物とそれを用いた紙送りローラ
WO2020105637A1 (ja) 2018-11-21 2020-05-28 東レ株式会社 ポリアミドマルチフィラメントおよびカバリング弾性糸

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US11851553B2 (en) 2022-03-23 2023-12-26 The Goodyear Tire & Rubber Company Rubber composition for stiffness

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